Tesagrotis

Tesagrotis species are distinguished from related noctuine genera by genitalia characters, particularly male claspers and female bursa copulatrix structures. The genus name was erected to accommodate species previously placed in Euxoa and other genera. Identification to species level requires examination of genitalia or careful comparison of forewing pattern elements including the orbicular and reniform stigmata. Dissection and reference to Lafontaine's original description is necessary for definitive identification.

Based on collection records for constituent species, Tesagrotis occurs in montane and foothill habitats of western North America. Tesagrotis atrifrons has been collected in coniferous forest habitats. Specific microhabitat preferences for the genus remain poorly documented.

Western North America. Tesagrotis atrifrons occurs from British Columbia to California. Tesagrotis piscipellis is known from Colorado and surrounding regions. Tesagrotis corrodera and T. amia have more restricted ranges in the western United States.

Adults have been recorded from late spring through summer. Specific flight periods vary by species and elevation. Tesagrotis atrifrons has been collected from June to August.

• EuxoaTesagrotis species were previously classified in Euxoa before Lafontaine's 1998 revision. Both genera share similar forewing patterns and noctuine genitalia plans, requiring dissection for separation.
• NoctuaSimilar overall appearance and size; distinguished by genitalia structure and forewing pattern details of the stigmata.

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